Head to head
1
Hard
1
Roscoe Tanner's wins on the left · John Marks's on the right · bar lengths share one scale
All meetings (2)
| 1979 | US Open | Hard | R128 | Roscoe Tanner | 6-4 6-2 6-0 |
| 1976 | Hong Kong | Hard | R64 | John Marks | 6-3 6-4 |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.